Shen, Z., McMillan, O., Jin, F. and Al-Tabbaa, A. (2016) Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study. Journal of Hazardous Materials, 316, pp. 214-220. (doi: 10.1016/j.jhazmat.2016.05.042) (PMID:27236430)
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Abstract
Salisbury biochar (produced from British broadleaf hardwood) with two different particle sizes (≤2 mm and ≤0.15 mm) was applied on a kaolin with three different lead (Pb2+) contamination levels (50 mg/kg, 300 mg/kg and 1000 mg/kg) at the dosage of 1% in w/w. The short-term impact of biochar on the mobility and speciation of Pb2+ in the kaolin was investigated using attenuation periods of 1, 7 and 28 days. The leachability and extractability of Pb2+ in carbonic acid leaching and EDTA extraction tests as well as the speciation of Pb2+ in soils were not significantly affected by biochar treatment during all periods. The insignificant effects of biochar on Pb2+ immobilisation were most likely attributed to the high adsorption capacity of Pb2+ on the kaolin and biochar failed to competitively adsorb Pb2+ against kaolin. The kaolin immobilised Pb2+ primarily through cation exchange, which represents the readily bioavailable fractions of Pb2+ in soils and may still pose environmental risks. This paper suggests the inefficiency of biochar treament on heavy-metal contaminated clay-rich soils. Therefore a laboratory treatablity study with respect to the soil type may be crucial when large-scale biochar applications in heavy-metal associated soil remediation are evaluated.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Jin, Dr Fei |
| Authors: | Shen, Z., McMillan, O., Jin, F., and Al-Tabbaa, A. |
| College/School: | College of Science and Engineering > School of Engineering > Infrastructure and Environment |
| Journal Name: | Journal of Hazardous Materials |
| Publisher: | Elsevier |
| ISSN: | 0304-3894 |
| ISSN (Online): | 1873-3336 |
| Published Online: | 13 May 2016 |
| Copyright Holders: | Copyright © 2016 Elsevier B.V. |
| First Published: | First published in Journal of Hazardous Materials 316: 214-220 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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